New here… sort of

I did not apply for SAVE (I didn’t think it would benefit me). I see now that I should have, and that I can. Should I apply now, or wait? It says if I pay $X my loans will be pain off in 2031, and some 30k with be forgiven. How does this work? I don’t want to mess anything up, but I would like to get ride of these loans. I have owed 61k for the last 5 years. Thanks for any info!